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SEC Consult SA-20141031-0 :: XML External Entity Injection (XXE) and Reflected XSS in Scalix Web Access



SEC Consult Vulnerability Lab Security Advisory < 20141031-0 >
=======================================================================
              title: XML External Entity Injection (XXE) and Reflected XSS
            product: Scalix Web Access
 vulnerable version: 11.4.6.12377 and 12.2.0.14697
      fixed version: -
             impact: Critical
           homepage: http://www.scalix.com/
              found: 2014-08-27
                 by: R. Giruckas, A. Kolmann
                     SEC Consult Vulnerability Lab
                     https://www.sec-consult.com
=======================================================================

Vendor description:
-------------------
"Employees need to access their email from wherever they happen to be – on the
road, at customer sites, remote offices, and at home. Users who need remote
access to their email often include customer-facing sales and support
personnel, who need to stay connected and informed to be responsive to
customers. The problem is, most web clients have slow performance and limited
functionality. Scalix Web Access is different. It is an AJAX-based web client
that delivers the look and feel, usability and performance of a desktop
 application."

Source: http://www.scalix.com/communityedition-scalixwebaccess


Business recommendation:
------------------------
By exploiting the XXE vulnerability, an unauthenticated attacker can get
read access to the filesystem of the Scalix Mail Server host and thus obtain
sensitive information such as the configuration files, etc.
It is also possible to scan ports of the internal hosts and cause DoS on
the affected host.


Vulnerability overview/description:
-----------------------------------
1) XML External Entity Injection
The used XML parser is resolving external XML entities which allows attackers
to read files and send requests to systems on the internal network (e.g port
scanning). The risk of this vulnerability is highly increased by the fact
that it can be exploited by anonymous users without existing user accounts.

2) Reflected XSS
The Scalix mail administration login panel is prone to the reflected cross site
scripting attacks. The vulnerability can be used to include HTML or JavaScript
code to the affected web page. The code is executed in the browser of users
if they visit the manipulated URL.


Proof of concept:
-----------------
The proof of concept information has been removed from this advisory as the
vendor failed to respond within 50 days and no patch is available.


1) XML External Entity Injection
The unauthenticated XML External Entity Injection vulnerability can be
exploited by issuing a specially crafted HTTP POST request to the [removed]
handler.


2) Reflected XSS
The supplied parameter value in the [removed] script is reflected without
proper validation and executed in the context of the web browser.


Vulnerable / tested versions:
-----------------------------
The XXE vulnerability has been verified to exist in the Scalix Web Access
version 11.4.6.12377 and 12.2.0.14697.

The reflected XSS vulnerability has been verified to exist in the Scalix Web Access
version 11.4.6.12377. Version 12 has not been tested against XSS.


Vendor contact timeline:
------------------------
2014-09-11: Contacting vendor through info@xxxxxxxxxx, requesting encryption
            keys and attaching responsible disclosure policy
2014-10-13: No response so far, hence trying again by contacting vendor
            through info@xxxxxxxxxx
2014-10-28: No response so far, hence trying again by contacting vendor
            through info@xxxxxxxxxx
2014-10-31: SEC Consult releases security advisory


Solution:
---------
None available.


Workaround:
-----------
There is no workaround known other than to disable Scalix Web Access until a
thorough security review has been performed and patches are available.


Advisory URL:
-------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm


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EOF A. Kolmann / @2014

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